ABCD

Example

A
C
B
_
C
B
B
_
C
A
C
26
26
19
13
 
 
A
B
C
_
_
_

Solution

A
C
B
19
C
B
B
13
C
A
C
26
26
19
13
 
 
A
B
C
8
2
9
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ABCD
ABCD

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